diff --git a/docs/source/conf.py b/docs/source/conf.py
index 667126f..a2e86bb 100755
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -10,6 +10,7 @@
 # serve to show the default.
 
 import contextlib
+import importlib.metadata
 import os
 import sys
 import time
@@ -76,7 +77,7 @@
 # built documents.
 #
 # The full version, including alpha/beta/rc tags.
-release = aiida_test_cache.__version__
+release = importlib.metadata.version(aiida_test_cache)
 # The short X.Y version.
 version = '.'.join(release.split('.')[:2])